[sagrath]

Anyone aware of any alsa problems?

Hence, I did install this addon, launching retroarch, or ROMS directly with retroarch, and I did not get any sound.
I think Kodi is locking the alsa-device and therefore blocking sound from retroarch.

Any solution for this? Using pulseaudio is not a option as I've read it does not support all audio-formats with passthrough.

 Yes! Kodi lock the sound if you use determined option on sound settings. I don't remember what setting is (on work right now), but it's quite simple to resolve: Set an option on sound settings in Kodi and launch a rom with retroarch from AEL, if the sound is muted, exit retroarch, go back to kodi settings e select other setting. Repeat until get sound on retroarch.

Cheers